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好学题库|To maintain forests as valuable “carbon sinks,” we may need to_____.
  外国→英语|A|preserve the diversity of species in them$B|accelerate the growth of young trees$C|strike a balance among different plants$D|lower their present carbon-absorbin…〔09-10〕
标签:Text 2学段:研究生学科:英语来源:好学题库作者:XieZiyi点击收藏
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